add clock module

The Clock module is the system clock that every unix timestamp new goes
through.  It comes with an offset that only tests can set.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/remake/mod.rs b/src/remake/mod.rs
index 9085475..3980d38 100644
--- a/src/remake/mod.rs
+++ b/src/remake/mod.rs
@@ -58,6 +58,15 @@ pub(crate) trait Host: Clone + Send + Sync + 'static {
     /// This node's in-memory remake state.
     fn remake(&self) -> &RemakeState;
 
+    /// This node's wall clock (`clock`): deadlines, votes and decisions are stamped and
+    /// judged with it. Shared, so closures run under the document lock can read it.
+    fn clock(&self) -> Arc<crate::clock::Clock>;
+
+    /// Now, in Unix milliseconds, by [`clock`](Self::clock).
+    fn now_millis(&self) -> u64 {
+        self.clock().now_millis()
+    }
+
     /// This node's ID (its peers know it by this).
     fn node_id(&self) -> String;